第三人称单数：keels over 现在分词：keeling over 过去式：keeled over
1.翻身,倾覆,颠倒
2.〈口〉突然昏倒
1.if a person keels over, they fall, especially because they unexpectedly feel sick
2.if a ship keels over, it falls sideways
3.to suddenly stop working correctly
keels overkeels overkeels over